numeric

问题 I have an array and want to create a new numeric array. This looks like this: $created_old = explode("_", $result[$i]["created"]); $created_new = array(); $created_new[0] = $created_old[2]; $created_new[1] = $created_old[0]; $created_new[2] = $created_old[1]; $created_new[3] = ""; $created_new[4] = rtrim(explode(":", $created_old[3])[2], ")"); //Get name from the database $created_new[3] = $name; $created = implode("_", $created_new); This version works just fine, but the previous was missing

问题 The user will input 2 integers, x and y, using standard input. You need to calculate the remainder of x modulo y (x % y). Now, here is the problem: 0 <= x <= 10^100000, (this is "less than or equal" not an arrow). 0 < y <= 100000 We are looking for optimal solution (Time Complexity). I didn't find the answer on Stackoverflow, so after finding the solution I thought that I should pose this question here for future reference and to see if there are better ways. 回答1: BigInteger has the

问题 How do I check with HTML5 if input is between 1-100? <input type="numeric" name="count" pattern="[1-9]" /> 回答1: Using min and max . <input type="number" name="count" min="1" max="100"> Note the type is number . 来源： https://stackoverflow.com/questions/13569365/html5-input-numeric-between-numbers

问题 I have a textInput box called systolicInput. To record the users blood pressure. When the user taps on the textInput the iOS virtual keyboard comes up. But it defaults to alphabetic input. How can I force it to display the numeric input keyboard? I am using ActionScript 3. PS: Thanks for reading this post, and any insight will be very much appreciated :) 回答1: Control of the keyboard type is possible in AIR 3 using the new StageText class. (You will have to manually update the AIR SDK to use

问题 i want to set form validation so that user cannot add special characters like $, @, &, etc... only alpha numeric characters are allow $this->form_validation->set_rules('cat_name', 'Category Name', 'trim|xss_clean|required|is_unique[cht_category.cat_name]|min_length[5]|max_length[75]|alpha_numeric'); when i add category name with space then i get following error "The Category Name field may only contain alpha-numeric characters." when i add category name without space or single word then its

问题 As a continuation of my previous question, Simon's method to find the list product of a PackedArray is fast, but it does not work with negative values. This can be "fixed" by Abs with minimal time penalty, but the sign is lost, so I will need to find the product sign separately. The fastest method that I tried is EvenQ @ Total @ UnitStep[-lst] lst = RandomReal[{-2, 2}, 5000000]; Do[ EvenQ@Total@UnitStep[-lst], {30} ] // Timing Out[]= {3.062, Null} Is there a faster way? 回答1: This is a little

问题 On many older laptops and some compact keyboards there is an integrated numeric keypad in the main keyboard area. This alternate keypad is activated with a special 'Fn' key next to the left Ctrl key. As a programmer I learned to use the cursor movement keys (arrows, PgUp, PgDn etc.) and found it greatly improved my programming speed. And the benefits were not bound to just a single application as is the case with specialised shortcut keys. On conventional PC keyboards, the 'Windows Key' can

问题 How can I tell R to round correctly? Decimal Places in R I have encountered a problem that I cannot figure out how to solve I want R to calculate 5/26*100 = 19.230769 x <- 5/26*100 x gives me: [1] 19.23077 Let's try to use round(), first setting the digits to 4: x <- round(5/26*100,digits=4) x gives: [1] 19.2308 Next, let's set the digits to 5: x <- round(5/26*100,digits=5) x gives: [1] 19.23077 Now, let's set the digits to 6: x <- round(5/26*100,digits=6) x gives: [1] 19.23077 Can anyone

问题 I have to solve the following transcendental equation cos(x)/x=c for given constant c. For example I did a short code in Mathematica, where I generated a list of random values for constant c const = Table[RandomReal[{0, 5}], {i, 1, 10}] (*{1.67826, 0.616656, 0.290878, 1.10592, 0.0645222, 0.333932, 3.59584, \ 2.70337, 3.91535, 2.78268}*) Than I defined the function f[x_, i_] := Cos[x]/x - const[[i]] and started looking for the roots: Table[FindRoot[f[x, i] == 0, {x, 0.1}][[1, 2]], {i, 1,

问题 is_numeric, intval, ctype__digit.. can you rely on them? or do i have to use regex? function isNum($str) { return (preg_match("/^[0-9]+$/", $str)); } what do you guys think? am i stupid? 回答1: One important difference between ctype_digit and is_numerict is negative values and float number. is_numeric(-10) will return true whereas 'ctype_digit(-10)' will be false also ctype_digit(12.50) will return false whereas is_numeric(12.50) will be true So both of them are handy depends on the context of